Low-freezing liquid.



UNITED STATES PATENT OFFICE.

MATTHEW ALBERT HUNTER, 0F TROY, NEW YORK.

Low-FREEZING LIQUID.

No Drawing.

lng a low vapor pressure which will freeze only at a very low temperature and which will mix with other liquids to prevent the same from freezing at low temperatures. I

obtain this object by means of a liquid pro-- duced as hereinafter described.

It is found by experiment that carbon tetrachlorid (GU1 freezes at about 25 below zero on the centigrade scale and that carbon dichlorid (Q Cl freezes at about 15.5 below zero on the centigrade scale. By experiment I find that by mixing the two liquidstogether, using the carbon tetrachlorid as a base and adding carbon dichlorid until the mixture is 36% carbon dichlorid the freezing point is lowered in a regular manner until the temperature of 60.5 below zero on the oentigrade scale is reached. This point is a eutectic mixture of (1.01 and C 01, and represents the lowest freezin mixture of the mixed liquids. On increasing the amount. of carbon dichlorid beyond 36% the tenmerature at which the mixture freezesis constantly raised again in a regular manner until the liquid is practically pure carbon dichlorid which freezes at 15.5/ below'zero on the centigrade scale.

The mixture obtained by uniting the two liquids as aboveset forth has great utility -where a. liquid. is required .to wlthstand exceedingly' low temperatures without chang- Speciflcation of Letters Patent.

Patented Dec. 30, 1913.

Application file d August 8, 1913. Serial No. 783,717.

ing into the solid state. It may be used for replacing the solution of brine 'or calcium 4&- chlorid in the ordinary processes of refri eration. Also for replacing solutions of icohol in hydraulic jacks operated out of doors in cold weather. Also for mixing with oils for electrical transformers used out of doors. A mixture of carbon tetrachlorid and carbon dichlorid unites perfectly with transformer oil giving a homogeneous mixtuge without subsequent separation of the component parts. A mixture of carbon tetrachlorid and carbon dichlorid may be used alone or with any of the oils now in use for that purpose. Such amixture will increase the temperature range of operation. Such a mixture is also absolutely non -inflammable. 60 Only under extraordinary conditions can either carbon tetrachlorid or carbon dichlorid be set on fire and the mixture as above set forth is non-inflammable. Also the mixture of carbon tetrachlorid and carbon dichlorid has a lower vapor pressure than tetrachlorid of carbon alone. Wherr exposed to the ordinary temperature the evaporation of the-mixture above described is much less than pure tetrachlorid of carbon alone.

What I claim as my invention and desire to secure by Letters Patent is, r

1. A low freezing mixture composed of carbon tetrachlorid and carbon dichlorid.

2. A low freezing mixture composed of carbon tetrachlorid and carbon dichlorid mixedwith another liquid, substantially as described for the purposes set forth.

In testimony whereof I aflix my signature in presence of two witnesses.

MATTHEW ALBERT HUNTER.

Witnesses: I t

- BET-A VAN DER VoLoEN,

WALTER E. WARD. 

